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### 27 Cards in this Set

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 the ratio between the frictional force and the normal force of an object. The number represents how rough or smooth two surfaces are when moving across one another Coefficient of Friction a push or a pull that tends to change the motion of an object or prevent an object from changing motion. Force is a vector quantity and thus has both magnitude and direction Force a force that resists the relative motion of two objects in contact caused by the irregularrities of two surfaces sliding or rolling across each other Friction the property of a body that causes it to remain at rest if it is at rest or to continue moving with a constant velocity unless an unbalanced force acts upon it inertia the total force acting on a body is equal to the mass of the body times its acceleration. (Newtons 2nd Law) Law of acceleration For every force applied by object A to object B(action), there is an equal but opposite force exerted by object B on object A(reaction).(Newtons 3rd Law) Law of Action and Reaction A body that is in motion continues in motion with the same velocity (at constant speed and in a straight line) and a body at rest continues at rest unless an unbalanced(outside) force acts upon it. (Newtons 1st Law) Law of Inertia a measure of inertia of a body Mass Force perpendicular to the contact surface Normal Force The amount of gravitational pull exerted on an object by the earth or by another large body Weight A collision in which two objects return to their original shape without being permanently deformed Elastic Collision The product of the force exerted and the time interval during which the force acts on the object. Impulse equals the change in momentum of an object in response to the exerted force Impulse If the mass of an object is constant, then a change in its velocity results in a change of its momentum. Impulse-Momentum Theorem A collision in which two objects couple together Inelastic Collision When no outside forces are acting on a system of moving objects, the total momentum of the system remains constant Law of Conservation of Momentum A measure of the amount of inertia and motion an object has or the difficulty in bringing a moving object to rest. Momentum equals the mass times the velocity of an object Momentum The point of any body at which all of its weight can be considered to be concetrated Center of Gravity A force produced by forces pushing inward on the ends of an object Compression Two or more forces applied to, or actiong at, the same point Concurrent Forces The force that produces equilibrium Equilibriant Force An object is said to be in equilibrium when the net force acting on it is zero. A body that is in equilibrium is either at rest or moving at a constant velocity Equilibrium The sum of all parallel forces on a body in equilibrium must be zero First Condition of Equilibrium The sum of the forces applied at the same point, the single force that has the same effect as the two or more forces acting together Resultant Force The sum of the clockwise torques on a body in equilibrium must be equal to the sum of the counterclockwise torques about any point Second Condition of Equilibrium The study of objects that are in equilibrium Statics A strectching force produced by forces pulling outward on the ends of an object Tension The tendency to produce change in rotational motion. Equal to the applied force times the length of the torque arm Torque